Jack



Dec. 22, 1953 c. w. LINCOLN ETAL 2,663,542

JACK Filed Aug. 6, 1949 2 Sheets-'Sheet l Dec. 22, 1953 C, W LINCQLN ETAL 2,663,542

JACK

Filed Aug. 6, 1949 2 Sheets-Sheet 2 Snneutors u l Gttornegs Patented Dec. 22, 1953 UNITED AS'TTIITES PATENT OFFICE A. .lGalonska Saginaw, Mich., .assignors .to Gen- -eral Motors Corporation, Detroit, Mich., a cnr- .porationof Delaware Application 1411211566, 1949 v"SerialN50. 108916 (Cl. .25h-100) T9 :Claims l 'This invention relates to jacks andmore par tieularly to an improved bumper jack.

The ,bumper 4jack which is lillustrativeof 'the invent-ion lconsists of a tubular "column mounted on a supporting `foot. At the top of the column a cap Iprovides -a support for the jack screw. A handle is connected to thejack Vscrevv above the cap and a ,special vbearing supports the load-care 'rying :screw on ball .bearings 'when VIthe ^load is being raised and on a :plane bear-ing when the load .is 'lowered to provide suilicien't `friction to hold the load in raised lposition. This lbearing and handle is fully described .in (1o-pending 4application Serial Number 6575.553123, filed June 1-0,

1946, by Godfrey G. Kearful et al. which .has

matured into Patent 2,609,178. The column Eh'as a ylongitudinal slot on the backside. The .load supporting hook extends from the front side of the :column and Ihas ia cylindrical portion surrounding .the column. .From .the inside of the vrear Vportion fof vthe cylindrical part of the 'hook an abutment extends into the tube and has an annular end part. The screw .passes through 'the center of the `annular abutment and has a ball nut :below the abutment to .raise VAand `lower the hook.

The object of the invention Vis to `provide `a column supported jack, with a load member Vextending .from rone side of the column to support 'the load and extending into a slot Vat the Iother side of the column to engage the jack operating means.

Another obiect of the .invention is to provide a load supporting member slidably .mounted Eon a Islotted column which loads the column so that it tends to hold .the column closed, and loads Vtbe slotted side vin tension and the full side .in compression.

Another object of lthe invention is to `provide an improvedsnap ring lock to maintain the screw .in the column and .au improved :fastener to hold the hook on the ball nut.

Tnese and other objects will be more apparent from the following drawings and description of a preferred embodiment of the invention.

.In the drawings-P Figure 1 is .a sectional view of the jack.

Figure 2 is a partial sectional view of .Figure 1 on the. line m2.,

Figure 3 .is .a partial sectional view of .Figure .l on the line 3-3..

Figure 4 is .a partial sectional view of Figure 1 on the line 4-.-4.

Figure 5. is an enlarged .partial view showing thesnap ring.

lli

e |16 -in position.

. iin the hub vliti.

.Figure 6 a partial perspective view'wth parts broken away l'to show the hook mounted on the column andrsupported by the screw and nut gear.

Figure 7 vis Ia perspective View of a fastener.

The bumper vjack illustrated in the drawings consists of a main supporting column it of cylindrical form lhaving a longitudinal slot l2 .at the backside of the column vopposite the hook at the 'front of the column. (The lower `end of the coln umn is supported in -a cup lil which forms the center portion of the supporting foot, The supporti-ng foot consists or" @a base plate i6 which Vhas a 'recess F8 to receive the lower end of the Acup 5M. The cup -l'li is :held in vertical position by ra brace plate 20. The brace plate 2t has a 'substantially `'eccentric conical shape with 'an lanerture 22 'at the apexof the cone surrounded by 'a flange l 'which is welded to the top of the cup t4. VThe conical portion lof the `brace plate .2@ extends ldowirward and youtward to the base plate l and has, "ferti'c'ally Iextending feet '26 extendving below the 'base nlate. Intermediate portions S28 ofthe `feet i126 vare crimped inward to `form a flange which V'engages and secures the base .plate lt will .be .noted that the supporting foot Vextends further from 'the front side of the column where 'the load supporting hook will be located.. A boss 32 is Istamped .into the upper 'portion of the side wall of the cup lli, and

nts into the 'slot 12 of the column to prevent rotation of the column in the foot. A leaf spring 3@ is .secured to the vlower end of the column, .and engages the .boss 32 to vertically hold the column inthe cup I 't of .thezsupporting foot.

canti! .havingxa central aperture surrounded by a spherical lseat :is secured to the upper end of .the column le, .in order to support the jack screw klli) which ycasses through the aperture. A hub 432 having a Isquare aperture is non-rotatably secured Ato the square end of the screw 455 by nut te. .As lbest .shown in .Figure 4 a handle consist ing of a pair lof 'wi-res .or rods 'et with ilmvvardly bent .pntl'e `,pmtions 43 at vone end of the rods extends into vdiametrically opposeo apertures til handle rods #25 are secured together by the brace 52 and have a hand grip 54 .,-pivotally .mounted at the Yother end. The hub 42 .has 4handle stop elements '5e stamped in `the side wall Vof the hub A42 adjacent the apertures 59. These .stop elements 5.5 `frictionally retain the :handle in horizontal position, but allow it to Abe folded to other more Vconvenient positions as shown by the partial Adot-'and-dash lines in This handle construction and 'the brake construction kare disclosed in Patent the screw and bearing plate 62 moves the bear-A ing plate with the screw, so that the ball bearing 68 is rendered inoperative, and the relative rotation occurs between the bearing plate $2 and the cap 33. The increased friction of this plane bearing structure prevents the weight of the load from lowering the jack.

The screw i9 is retained within the column by a stop arrangement consisting of an annular groove 55 in the screw immediately under the cap 3S. A snap ring es rits into the groove 65 and is retained in place by a washer 6l' having an internal recess 52 at the lower edge, so that the washer not only engages the top of the ring to hold the washer in position, but also engages the outside ci the to hold the ring 65 in the groove 65.

The load supporting hook 68 extends outwardly from the front of the jack column H3 over the extended portion of the foot, and has a load supporting pad lt adjacent the end. The hook $8 has an upper guide pad l2 and a lower guide pad Ill engaging the front face of the column to provide a more even distribution of the load. At the upper guide pad 'i2 and hook structure is extended to provide a cylindrical collar 'I6 extending around the column. At the rear portion of the collar 'i8 a tongue 'i8 extends through the slot 42 of the column, and has an enlarged abutment 80 located inside the column having a central aperture B2 through which the screw w passes.

The lower surface of the abutment 88 has a spherical surface S concentric with the aperture 62 which seats on a spherical surface 86 on the top of the ball nut 88. The ball nut 88 is of conventional construction with grooves Qi! and a return passage Si? to provide for the circulation of the balls. A pin 94 extends fromy the rear face of the ball nut into slot I2 to prevent rotation of the ball nut, but to allow sliding movement of the ball nut within the column.

Excessive separation between the hook S8 and the ball nut 83 is prevented by a fastener 96 engaging the upper edge of the tongue 'i8 and abutment 543 with a hook 93, and engaging the pin Q5 on the call nut Bil with the hook 02.

. r'he load on this hook tends to stabilize and stiffen the jack supporting column. The hook 68 has a collar portion 'd surrounding the column IS to prevent spreading and distortion of the column. There is, a tendency to close the slot i2 in the column, but this distortion is resisted by the tongue 7B which lls an extended'portion of the slot. At the front where the column is subjected to compressive stresses the full section of the tubular column is employed for the maximum strength. lThe slot l2 is positioned in the column in the region where tensile stresses are impressed on the column. This is the region of minimum stress, and it may be lightened without weakening the column with regard to the load applied by this hook. The guide pads I2 and 14 are also spaced apart to reduce the bending load on the column. The hook H32 which prevents excessive separation between the hook and nut, provides internal helical c( for limited relative separation, so that freedom of rocking movement between the hook 68 and the nut S8 on the spherical seats 8d and 86 is maintained. The column lil is also tilted toward the slotted side to counteract the couple produced by the eccentric load on the hook G8.

The preferred embodiment of the invention is illustrated above. Other modications of the invention may be made within the scope of the appended claims.

We claim:

1. In a jack, a supporting column having a slot, a screw-rotatably supported on said column, a nut on said screw, a load hook supported on said nut, a member extending from said nut into said slot,

v and a fastener hook engaging said load hooi; and -said member to prevent excessive separation of said load hook and nut.

2. In a jack, a support column having a slot at one side, a load supporting hook having a load pad on the other side and a guide sleeve surrounding said column and an abutment portionY extending into said slot, a screw rotatably supported in said column, a nut on said screw engaging said abutment portion, and means on said nut sliding in said slot to prevent rotation of said nut.

3. In a jack, a support column having a longitudinal slot at one side, a load supporting hook having a load pad extending from the other side of said column, said hook having a sleeve portion surrounding said column, a tongue portion extending from said sleeve into said slot, an apertured abutment on the end of said tongue, a screw rotatably supported on said column and extending through said apertured abutment, a nut on said screw below said abutment, and means to prevent rotation of said nut with respect to said screw.

4. In a jack, a support column having a longitudinal slot at one side, a load supporting hook having a load pad extending fromthe other side of said column, said hook having a sleeve portion surrounding said column, a tongue portion extending from said sleeve into said slot, said tongue extending longitudinally in said slot and having the same width as said slot to maintain the slot spacing, an apertured abutment on the end of said tongue, a screw rotatably supported on said column and extending through said apertured abutment, a nut on said screw below said abutment, and means to prevent rotation of said nut with respect to said screw.

5. In a jack, a support column having a longitudinal slot at one side, a load supporting hook having a load pad extending from the other side of said column, said hook having a sleeve portion surrounding said column, a tongue portion extending from said sleeve into said slot, an apertured abutment on the end of said tongue, a screw rotatably supported on said column and extending through said apertured abutment, a nut onhaving a recess in the inner lower edge positioned on said screw with said ring in said recess.

7. In a jack, a supporting column having a slot, a cap secured to said column, a screw rotatably supported on said column by a bearing engaging said cap, a nut on said screw, a load hook supported by said nut, an annular groove in said screw below said cap, a split ring in said groove, and an annular abutment having a recess in the inner lower edge positioned on said screw with said ring in said recess to retain said screw in said column.

8. In a jack, a supporting column having a slot, a cap secured to the top of said column, a screw rotatably supported on said column by a bearing engaging said cap, a nut on said screw, means on said nut entering said slot to prevent rotation of said nut, a load hook supported by said nut, an annular groove in said screw below said cap. a split ring in said groove, and an annular abutment having a recess in the inner lower edge positioned on said screw with said ring in said recess for engagement with the lower edge of said cap to retain said screw in said column.

9. In a lifting jack, a load supporting column having a longitudinal slot in one side portion, a load supporting member having a guide portion extending around said column, said load supporting member having a, portion extending through said longitudinal slot and having an abutment portion within said column, means supported on said column and engaging said abutment portion to raise and lower said load supporting member, and said load supporting member having a load engaging portion extending outwardly from said column on a solid side portion diametrically opposed to said slot to place the side portion of said column having said slot in tension and the solid side portion in compression due to the oiT center loading on said load engaging portion.

CLOVIS W. LINCOLN. GODFREY G. KEARFUL. DAVID A. GALONSKA.

References Cited in the flle of this patent FOREIGN PATENTS Number 

